20021033100 has 144 divisors (see below), whose sum is σ = 60665617152. Its totient is φ = 5088272640.

The previous prime is 20021033099. The next prime is 20021033119. The reversal of 20021033100 is 133012002.

It is a happy number.

It is a super-2 number, since 2×20021033100² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1947574 + ... + 1957826.

It is an arithmetic number, because the mean of its divisors is an integer number (421289008).

Almost surely, 2^20021033100 is an apocalyptic number.

20021033100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20021033100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30332808576).

20021033100 is an abundant number, since it is smaller than the sum of its proper divisors (40644584052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20021033100 is a wasteful number, since it uses less digits than its factorization.

20021033100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10576 (or 10569 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 20021033100 its reverse (133012002), we get a palindrome (20154045102).

The spelling of 20021033100 in words is "twenty billion, twenty-one million, thirty-three thousand, one hundred".